On 12/30/2015 06:42 AM, Ravishankar N
wrote:
On 12/30/2015 04:20 AM, Kyle Harris
wrote:
Hello All,
Forgive the duplicate but I forgot
to give the first post a title so this corrects that.
Anyway, I recently discovered the new arbiter functionality
of the 3.7 branch so I decided to give it a try. First off,
I too am looking forward to the ability to add an arbiter to
an already existing volume as discussed in the following
thread: https://www.gluster.org/pipermail/gluster-users/2015-August/023030.html.
This is not implemented yet Kyle. We are targetting it for 3.8.
However, my first question for now
is can someone perhaps go into a bit of detail regarding the
difference between using this new arbiter functionality
versus adding a dummy node with regards to helping to
eliminate split-brain? In other words, a bit of information
on which is best and why?
See this thread https://www.gluster.org/pipermail/gluster-users/2015-October/023915.html
for more information. Client quorum is a better way to avoid
split-brain of files.
Arbiter is a type of replicate volume which uses client quorum (
plus some arbitration logic) to avoid split-brains.
Second, I noticed at the following
URL where is discusses this new functionality it says, and I
quote "By default, client quorum (cluster.quorum-type) is
set to auto . . ." which I found to be a bit
confusing. After setting up my new cluster I noticed that
none of the quorum settings including cluster.quorum-type
seem to have a setting?
The client-quorum is indeed enabled and set to auto; it is just
that the `volume info` output does not display it correctly. It
being fixed (http://review.gluster.org/#/c/11872/).
client-quorum is set to auto only for 3 way replication. For 2 way
replication there is no quorum.
Pranith
-Ravi
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